I seem to be having instances where the plugin works fine when logged in, but when logged out the widget's instance in the sidebar pushes all other widgets out to the footer (in my case anyhow). I've looked for all sorts of conflicts and can't find anything.

@Scotm, thanks for your patience. I believe there was a misplaced "div" tag which should be fix in the new version I just committed. You should see it in a few minutes. Please let me know if for some reason it is not fixed for you.